Emil f



(No Model.)

IE2. P. HOLMG'REN. MACHINE FOR ROLLING METAL TUBES.

Patented Dec. 29, 1896.

- UNITED STATES PATENT OF ICE.

EMIL F. I-IOLMGREN, OF BROOKLYN, NEW YORK, nssienon' fro THE SEAM LEss STRUCTURAL TUBE COMPA on nEWvoRK, N. Y.

MACHINE FOR ROLLING ETAL TUBES.

SPECIFICATION forming part of Letters Patent N 0. 573,877, dated December 29, 1896.

Application filed March 19, 1896.

Serial No. 583,873. (No modeli) Be it known that I, EMIL F. HOLMG-REN, of Brooklyn, Kings county, New York, have invented an Improved Machine for Rolling Metal Tubes, of which the following is a specification.

This invention relates to a machine for rolling metal tubes so as to decrease their thickness and to form on them, if desired, inwardlyextending swells or reinforced sections.

The object of the invention is to construct a machine by which the rolling action may be evenly performed and by which the degree of reduction of the work may be controlled with great accuracy.

I11 the accompanying drawings, Figure 1 is a vertical longitudinal section, partly in side View, of my improved machine for rolling metal tubes. Fig. 2 is a vertical cross-section on line 2 2, Fig. 1, with the mandrel and tube removed 5 Fig. 3, a detail of the shifting lever f,- Fig. 4, a longitudinal section of a tube rolled out by the machine; Fig. 5, a sectional plan of a modification of the machine, and Fig. 6 a longitudinal section of a tube rolled out by the modified machine.

The letter a represents the frame of the machine, having a slide-rest a, which is reciprocated by means of a rack a in the ordinary or suitable manner.

b is the power-pulley keyed to the tubular spindle b, which revolves in bearings of the machine. The spindle 19 carries on its end a head 0, which is made in the form of a disk with four (more or less) radial slots 0. Within these slots are guided. the radially-movable slides cl, that carry near their outer end a contact-roller cl and at their inner end a working or reducing roll (1 The head 0 is embraced by a flaring ring 6, adapted to engage the beveled edges of the rollers 01. j

It is clear that when the ring a is projected over the rollers d to a greater or less extent the slides 01 will be correspondingly moved inward to cause the rolls d to approach each other to any desired degree. The ring e is moved by means of a shifting lever f, pivoted at f to an arm f of the machine-frame. The lever f is provided with a pair of pins f engaging a circumferential groove 6 of ring a Thus by shifting the lever any desired movement may be imparted to the ring, as will be readilyunderstood. Alocl ing-pinf?,engag- I ing a perforation f of the lever and any one of a number of perforations f of the bracket fl, serves to lock the lever, and consequently the ring 6 and slides cl, in any of their working positions.

The operation of the machine will be readily 6o understood. The tube A to be reduced and containing the movable mandrel g is clamped to the tool-post a of the slide-rest a by means of the clamp-screw c The lever f is now shifted until the rolls (1 bite into the tubeA to the desired extent. Motion being imparted to the slide-rest a and to the pulley b", the tube A will be drawn through the rolls d of the revolving head 0 and will thus be reduced to the desired thickness. If it is desired to form inwardly-extending swells A on the tube A, the mandrel g is correspondingly reduced, as at g, when the displaced metal will be crowded inward. to form the swell. The end A of the tube indicates its original thickness 75. Where it has been clamped to the tool-post and has consequently not been acted upon by the rolls. This end may be either out off or it may be subjected to the reducing process in the same machine by reversing the tube.

In Fig. 5 the construction is the same as that previously described, excepting that a fixed mandrel h is substituted for the m0vable mandrel g. The mandrel his secured to the machine-frame at its rear end by bolts h and cross-piece 712, while it is provided at its front end and between the rolls d 'with a bulb h The work A, being drawn forward between the mandrel and rolls, will be reduced to the desired extent.

It will be seen that my machine may be readily adjusted to reduce differently-sized tubes or to reduce tubes to different degrees of thickness. The machine works quickly and accurately and produces superior results. 5

WVhat I claim isy 1. In a machine for rolling metal tubes the combination of a revoluble head with radiallymovable slides, reducing-rolls and contactrollers secured to opposite ends of the slides, a mandrel extending between the reducingrolls, a flaring ring engaging the contact-rollers, and means for shifting such ring, subengage the grooved ring, and means forlockstantially as specified. ing the shifting lever in position, substan- 1o 2. In a machine for rolling metal tubes the tially as specified. combination of a revoluble head With radially- I T 5 movable slides, reducing-rolls and contact- EMIL HOLMGREL' rollers secured to opposite ends of the slides, Witnesses: a grooved and flaring ring engaging the 0011- F. V. BRIESEN, tact-rollers, a shifting lever having pins that W. G. WHITING. 

